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    • 10. 发明公开
    • SHEET BLANK FORMING METHOD AND DEVICE FOR THE IMPLEMENTATION THEREOF
    • EP3453468A1
    • 2019-03-13
    • EP17894656.2
    • 2017-08-30
    • OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOST'YU "SAMER" (OOO "SAMER")
    • GILFANOV, Rinat MuzakhitovitchKNYAZEV, Sergei NikolaevichTRUSOV, Petr ValentinovichYANTS, Anton Yurievich
    • B21D22/22B21D24/04B21D24/14
    • The invention relates to machine building, namely to metal forming, and can be used in dies of sheet stamping to control local forces under a specified algorithm.
      The suggested technical object is aimed at increasing the technological capabilities of the sheet stamping process and accuracy of manufactured parts, as well as at increasing the possibility of its use on universal equipment.
      This task is solved by installation of a differentiated hold-down device into the die; the device ensures the following during workpiece forming: adjustment of metal flow and movement from the periphery into the deformation zone by way of local force control. The differentiated hold-down device has a hold-down made of sectors that are fastened on a plate, and each hold-down sector is equipped with a hydraulic device for force transfer under a specified algorithm. The differentiated hold-down device comprises a hydraulic device for force transfer under a specified algorithm, and, preferably, comprises a housing, a stem with a piston, wherein the housing comprises rings with an internal surface of variable cross-section, which together with the piston's peripheral surface form a clearance that may change during piston movement in relation to the housing. Additionally, the differentiated hold-down device may comprise a hydraulic device for force transfer under a specified algorithm, which consists of a housing, a stem with piston, the stem is hollow and has radial holes, while the piston is provided with a movable ring configured to close the piston hole, the housing comprises an axle of variable cross-section, one end whereof is made in the form of a piston placed in the stem cavity, wherein the movable ring together with the axle of variable cross-section form a clearance changing during movement of the hollow stem with the piston and ring in relation to the axle.